4 hands from an opponent, followed by a river decision...

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I bet. His range might be call down any pair against you because he knows your aggressive. He pretty much did that in hand #4. This board is different because there are two high cards instead of K23 and the way that board played out, if you didn't have a K you likely didn't hit anything. Still a flush came and he called down with a pair of threes.

The only reason I can see checking/calling is if he's aggressive enough to value bet any pair. This is also beneficial in case he's waiting till the river to raise you.

You check/raised him once on hand 1 when the ace came, but I think thats a different situation since he will naturally value bet top pair, but whether he'll value bet bottom or mid pair is dubious. I just bet out, i dont want him checking it through.